From patchwork Thu Oct 10 14:42:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 1174619 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=dlink.ru Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=dlink.ru header.i=@dlink.ru header.b="jS4Zsgce"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46pvGf4WLXz9sPL for ; Fri, 11 Oct 2019 01:53:30 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726523AbfJJOxP (ORCPT ); Thu, 10 Oct 2019 10:53:15 -0400 Received: from fd.dlink.ru ([178.170.168.18]:52200 "EHLO fd.dlink.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725959AbfJJOxP (ORCPT ); Thu, 10 Oct 2019 10:53:15 -0400 Received: by fd.dlink.ru (Postfix, from userid 5000) id A62161B210B7; Thu, 10 Oct 2019 17:43:51 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 fd.dlink.ru A62161B210B7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dlink.ru; s=mail; t=1570718631; bh=GvqeVN9ysGFiOtylE0GYxEuqYzgBWNb6Nz0VozKTHgc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jS4ZsgceNBUX5CdBQ9Ye5azBcsI4jUHZj8rrmNwF5MOXUmE56olo30Xy5/bcaSA0t xjwbOwfMGOkdHuxP0N6abQSZvagh27e8gtSaHUulxq+2UiKx9Oeg6xv9IXGqPKBDsd FJT+pcK9I58cNyHFK1jTWJV4XwNo8a7i9A0Sr0hU= X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail.dlink.ru X-Spam-Level: X-Spam-Status: No, score=-99.2 required=7.5 tests=BAYES_50,URIBL_BLOCKED, USER_IN_WHITELIST autolearn=disabled version=3.4.1 Received: from mail.rzn.dlink.ru (mail.rzn.dlink.ru [178.170.168.13]) by fd.dlink.ru (Postfix) with ESMTP id 216C01B219DF; Thu, 10 Oct 2019 17:43:40 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 fd.dlink.ru 216C01B219DF Received: from mail.rzn.dlink.ru (localhost [127.0.0.1]) by mail.rzn.dlink.ru (Postfix) with ESMTP id 2EE0D1B202D0; Thu, 10 Oct 2019 17:43:39 +0300 (MSK) Received: from localhost.localdomain (unknown [196.196.203.126]) by mail.rzn.dlink.ru (Postfix) with ESMTPA; Thu, 10 Oct 2019 17:43:39 +0300 (MSK) From: Alexander Lobakin To: "David S. Miller" Cc: Edward Cree , Jiri Pirko , Eric Dumazet , Ido Schimmel , Paolo Abeni , Petr Machata , Sabrina Dubroca , Florian Fainelli , Jassi Brar , Ilias Apalodimas , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Lobakin Subject: [PATCH net-next 2/2] net: core: increase the default size of GRO_NORMAL skb lists to flush Date: Thu, 10 Oct 2019 17:42:26 +0300 Message-Id: <20191010144226.4115-3-alobakin@dlink.ru> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191010144226.4115-1-alobakin@dlink.ru> References: <20191010144226.4115-1-alobakin@dlink.ru> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Commit 323ebb61e32b ("net: use listified RX for handling GRO_NORMAL skbs") have introduced a sysctl variable gro_normal_batch for defining a limit for listified Rx of GRO_NORMAL skbs. The initial value of 8 is purely arbitrary and has been chosen, I believe, as a minimal safe default. However, several tests show that it's rather suboptimal and doesn't allow to take a full advantage of listified processing. The best and the most balanced results have been achieved with a batches of 16 skbs per flush. So double the default value to give a yet another boost for Rx path. It remains configurable via sysctl anyway, so may be fine-tuned for each hardware. Signed-off-by: Alexander Lobakin --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index a33f56b439ce..4f60444bb766 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4189,7 +4189,7 @@ int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ int dev_rx_weight __read_mostly = 64; int dev_tx_weight __read_mostly = 64; /* Maximum number of GRO_NORMAL skbs to batch up for list-RX */ -int gro_normal_batch __read_mostly = 8; +int gro_normal_batch __read_mostly = 16; /* Called with irq disabled */ static inline void ____napi_schedule(struct softnet_data *sd,